6 ideas
Apart from a few inborn biases, such as liking sweetness and wariness of bitterness, nearly all of our specific likes and dislikes are acquired through experience, exposure and social context. Because preferences are learned, they can also be relearned in adulthood. Bad eating habits are therefore a skill deficit to be retrained rather than a fixed trait or a simple failure of willpower.
A disliked food often becomes accepted after roughly eight to fifteen small, pressure-free tastes. Familiarity itself breeds liking, so the tastes need no persuasion or reward attached. Most parents give up after only a few refusals and conclude that the child 'doesn't like' the food, when they stopped just short of the point where preference forms.
When children are told to eat vegetables in order to earn dessert, they learn that the vegetable is an unpleasant chore and that dessert is the prize. The reward framing increases their liking for the treat and decreases their liking for the target food. Coercion and bribery around food backfire because they signal that the food is not worth eating for its own sake.
Flavors from the mother's diet pass into amniotic fluid and breast milk. Infants exposed to a flavor this way, such as carrot, accept it more readily at weaning. Between roughly four and seven months babies are unusually open to new tastes, before toddler neophobia sets in, so varied early exposure has an outsized effect on lifelong range.
In a 1920s experiment, Clara Davis let weaned infants freely choose from an array of simple whole foods without adult steering. Over time they ate varied diets and thrived, despite erratic single-meal binges. The study suggests that appetite can self-regulate well when the menu consists of unprocessed foods. The environment of choices, more than the child's judgment, determines whether free choice produces a healthy diet.
Very young children stop eating when full regardless of how much is served. External cues such as plate size, serving amounts and social norms gradually replace internal satiety signals. On this view, overeating is a learned responsiveness to the environment, which can be retrained by reconnecting eating with actual hunger.